# Calculus problem

1. Oct 11, 2004

### mpm166

I have this calculus challenge problem (found here: http://firstyr.appsci.queensu.ca/apsc171/chall1.pdf)

I was able to answer part a and b, however I am unsure how to approach c and onwards

does anyone have any suggestions?

2. Oct 11, 2004

### Zurtex

Is it not just a matter or letting in your equation: $\varepsilon = \varepsilon + \Delta \varepsilon[/tex] So you have: $$V(x) = x^4 - 4x^3 + (\varepsilon + \Delta \varepsilon)x^2 + \delta x + 5$$ Differentiating the above with respect to x, knowing that [itex]\delta x = 0$ then equalising to 0 and solving for x and rearranging for $\Delta \varepsilon$? Not entirely sure what the question is asking so not sure.

Although thinking about it you would probably have to show which V'(x) = 0 is the minimum.

3. Oct 11, 2004

### mpm166

any other suggestions people?
I still seem to be having trouble

4. Oct 12, 2004

### Motifs

What is your trouble ?